Compilare: user.cpp: In function ‘void tarjan(int)’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void read()’: user.cpp:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:59: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void write()’: user.cpp:102: warning: comparison between signed and unsigned integer expressions user.cpp:103: warning: comparison between signed and unsigned integer expressions